Levantamento e análise de custos de construção e de operação do uso de estações de tratamento de rejeitos gerados em ETAs no Ceará por meio do CAPEX e do OPEX

Abstract

The improper disposal of waste from ETAs Water Treatment Plants, in the state of Ceará, is a major problem considering that it is a state located in the Brazilian semi-arid region and which frequently faces water shortages. Products used in water treatment, when they are released indiscriminately into a water resource without prior treatment, can pollute these waters and compromise the health of the biota that lives in this aquatic body or even people or animals that consume this water. There are Brazilian laws and regulations that prohibit the disposal of ETA waste into a water resource without prior treatment, and such action is classified as an environmental crime. In order to mitigate this problem and meet environmental standards, the Ceará Water and Sewage Company (CAGECE) has Generated Waste Treatment Stations (ETRGs) in order to treat waste from ETAs and propose an adequate destination of waste. same. The objective of this work is to survey the Construction and Operation costs of the ETRGs that will be implemented in Ceará by CAGECE. To this end, CAPEX and OPEX were used as cost survey tools. What was observed is that for each m³/h of flow from a WTP in the interior there is an approximate cost of R$ 5,570.00 for the construction of an ETRG and for one in the capital it is R$ 3,472.22 for each m³/ H. The average monthly operating cost of ETRGs in the interior is R$ 14,317.00, which represents R$ 171,804 per year of annual OPEX with each ETRG. Therefore, the cost of this strategy to mitigate the problem in question is high, but necessary. This highlights the importance of carrying out new studies on the topic in order to achieve a new, more economically viable strategy.